There’s Community and Consensus. But It’s No Commune.

The Pioneer Valley Cohousing Community in Amherst, Mass., is multigenerational, but some cohousing developments are mostly or exclusively occupied by senior residents.Credit
Matthew Cavanaugh for The New York Times

Moving into a new house that’s roughly a 90-second walk from that of your parents may not be the ideal living condition for most adults — in fact, for nine years that familial proximity provided most of the plot lines and barbed jokes of the TV comedy “Everybody Loves Raymond” — but that’s what drew Ben Brock Johnson, 37, to the town of Amherst, Mass.

In December, Mr. Johnson, along with his wife and their newborn twins, moved to a two-story, three-bedroom house in the Pioneer Valley Cohousing Community that is 120 yards away from his parents, Jane and Kit Johnson.

“The house is probably the furthest away from my parents’ that it could be, and still be within the community. So there’s a nice buffer zone there,” Mr. Johnson said.

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Jane Johnson and her husband, Kit, both 74, care for their 7-month-old twin grandchildren, Brock, left, and Audrey, at home at Pioneer Valley. The grandchildren live a short walk away.Credit
Matthew Cavanaugh for The New York Times

The 32-unit development on 23 acres of farmland is designed to encourage a cross section of people — young, old, and in between — to live together in a village-like setting. That means more opportunities for Mr. Johnson’s parents to see and care for their grandchildren, while still having their privacy.

“We did talk about boundaries, but that aside, we are thrilled to have Ben nearby,” said Jane Johnson, 74, a retired librarian from Stonington, Conn., who moved to Pioneer Valley with Kit, also 74, in 2013.

Pioneer Valley is one of 165 cohousing communities nationwide, with another 140 in the planning stages, according to the Cohousing Association of the United States. Most of these so-called intentional communities are multigenerational, while a growing number are either predominantly or exclusively occupied by senior residents. People own their own homes and can sell them on the open market. Residents pay into a fund to maintain facilities and collectively agree on how they should be used. Some, like Pioneer Valley, are rural. Others are suburban, and even urban.

“A lot of cohousing is out in rural areas, but we wanted to be in the city to be near things,” said Janet Boys, 68, of Denver. She and her husband, Don McGuire, 73, left Philadelphia in August to move into the Aria Cohousing Community, a former convent close to parks and Regis University. The convent’s dwindling community of seven nuns vacated the building when they could no longer maintain it, said Aria’s developer, Susan Powers of Urban Ventures LLC in Denver. The initial group of residents, who in 2013 expressed interest in transforming the building into a cohousing community, had a bit in common with the previous tenants.

“They were a group of single women, empty-nesters, who each lived in a single-family home and didn’t want to live alone anymore,” Ms. Powers said. Aria, which opened in August, now includes men and residents of every age.

The self-determination of Aria’s founding residents is a hallmark of cohousing, along with clusters of houses or living spaces gathered around shared public areas. The heart of each community is the common house, or a space, where group meals are offered once or twice a week, together with activities and events. Houses are connected by pathways. Instead of a lawn mower in every garage, there often are no attached garages. Cars are exiled to peripheral parking areas, while a single, shared lawn mower suits the needs of everyone.

The common house is also where residents gather to make decisions about governance. Cohousing communities are most commonly set up as homeowners’ associations, with residents adhering to legally binding bylaws. Yet with cohousing, there is one critical difference.

“We are our own board, since most cohousing communities operate by consensus,” said Karin Hoskin, executive director of the Cohousing Association of the United States and a resident of Wild Sage, a cohousing community in Boulder, Colo. Though typically not required, residents are expected, or at least encouraged, to attend the group dinners and pitch in where they feel most comfortable: maintaining the grounds, for example, or serving on committees. When it comes to finalizing decisions about maintaining common areas, or questions like noise levels in public spaces after certain hours, the entire community must agree. The objective, Ms. Hoskin said, was to regain a lost sense of community.

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Members of the Pioneer Valley Cohousing Community gather for dinner in the common house. The communities are operated by consensus but residents own their homes.Credit
Matthew Cavanaugh for The New York Times

“I know all of my neighbors. If I need to borrow some eggs, I know which houses I can go to where they’ll probably have eggs,” she said. “If they’re not home, there is a good chance I’ll have a key to their house. It’s really reminiscent of old-fashioned neighborhoods.”

Cohousing can be traced to Copenhagen, where the first “living communities,” or bofaellesskaber, opened in 1970. A decade later two architecture students, Charles Durrett and Kathryn McCamant, were on a year abroad at the University of Copenhagen. During Mr. Durrett’s daily commute through mundane suburbs, he noticed one complex that stood out.

“People in this one development were always out there talking to each other, sitting at picnic tables drinking tea. There were children running from house to house, and people coming and going to this building, the common house, where nobody lived and apparently everybody lived,” he recalled.

Mr. Durrett and Ms. McCamant later married and, in 1984, returned to Denmark to learn more about the concept. In 1988, they self-published a book on the topic, and three years later built America’s first cohousing community, Muir Commons, in Davis, Calif. Since then, their Nevada City, Calif., firm, McCamant & Durrett Architects/The Cohousing Company, has designed 55 cohousing communities across the United States, with more in development.

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“It’s definitely a good aging-in-place or downsizing model,” said Jim Leach, 77, a founder of Silver Sage, a senior cohousing community in Boulder, Colo.Credit
Nick Cote for The New York Times

The momentum for cohousing had been growing. The National Building Museum in Washington noted the recent “boom in cohousing communities nationwide” in a current exhibition. One reason for the boom is that cohousing construction is seen as a good investment, said Robert Jenkens, director of social impact initiatives at the National Cooperative Bank, a Washington lender that finances cohousing projects.

Sixty-two percent of people polled in a Cohousing Research Network survey last spring said that sale prices of cohousing units in their communities have been rising, according to an analyst for the network, Angela Sanguinetti. But, substantial down payments are not always required for prospective residents. Many developments offer units eligible for F.H.A. loans.

“I’ve seen some terrific examples of cohousing developments that incorporate a number of low-income units, as many as 20 to 40 percent,” Mr. Jenkens said.

Still, there are those for whom cohousing might not work.

“Some people feel that cohousing is too much togetherness,” said the social scientist Bella DePaulo, who wrote about cohousing in her book, “How We Live Now: Redefining Home and Family in the 21st Century.” The model is also not for those who bristle at the self-governing element, she added. Then there is cohousing’s association with hippies.

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Silver Sage Village residents at a potluck dinner. There are about 165 cohousing communities in the United States, with roughly 140 in development.Credit
Nick Cote for The New York Times

“People immediately think communes, but cohousing is not a commune where everyone lives under one roof,” Dr. DePaulo said.

For aging hippies and baby boomers, however, dedicated senior cohousing offers an alternative to a retirement home.

“It’s definitely a good aging-in-place or downsizing model for people in their 50s and early 60s who still have quite a bit of life ahead of them, but want to move out of the old family house because they want less maintenance,” said Jim Leach, 77, a founder of Silver Sage Village, a cohousing community of mostly seniors in Boulder.

Community living can also be a balm for the documented isolation and loneliness plaguing older Americans, which researchers say threatens public health. According to a 2010 AARP survey, social networks ease the loneliness that can follow the loss of a spouse, or family members’ moving, Ms. Hoskin said.

“People aren’t staying where they grew up anymore, and a huge trend among seniors is that they don’t have their siblings or their kids around them because they’ve gone away to university or moved out of state for a job. Living in a community can help people feel connected,” Ms. Hoskin said.

Correction: January 21, 2018

A picture caption with an earlier version of this article misidentified Jane and Kit Johnson’s grandchildren. Brock is on the left, not the right.

Correction: January 22, 2018

An earlier version of this article misstated the given name of the director of social impact initiatives at the National Cooperative Bank. He is Robert Jenkens, not Richard.

A version of this article appears in print on January 21, 2018, on Page BU5 of the New York edition with the headline: There’s Community and Consensus, but No Commune. Order Reprints|Today's Paper|Subscribe